refactor: use pytest fixtures to reduce repetition in tests

[Aswinr24]

Description

Refactored the parameter processing test cases to use pytest fixtures and pytest.mark.parametrize to reduce code duplication and improve test maintainability.

Related to #4502

Type of change

• Code refactor (test improvements to reduce repetition)

Key checklist:

• No style issues: $ pre-commit run (or $ nox -s pre-commit) (see CONTRIBUTING.md for how to set this up to run automatically when committing locally, in just two lines of code)
• All tests pass: $ python run-tests.py --all (or $ nox -s tests)
• The documentation builds: $ python run-tests.py --doctest (or $ nox -s doctests)

You can run integration tests, unit tests, and doctests together at once, using $ python run-tests.py --quick (or $ nox -s quick).

Further checks:

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.42%. Comparing base (3bf3ea8) to head (57597bd).
Report is 178 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #4509   +/-   ##
========================================
  Coverage    99.42%   99.42%           
========================================
  Files          299      299           
  Lines        22691    22691           
========================================
  Hits         22560    22560           
  Misses         131      131           

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[agriyakhetarpal]

Thanks for making a start, @Aswinr24! I've added a few suggestions below; please let me know what you think?

[Aswinr24]

Thanks for your suggestions, @agriyakhetarpal ! I've made the changes based on your feedback. Let me know if anything else needs tweaking

[agriyakhetarpal]

Thanks, @Aswinr24! FYI, I changed the "Fixes" keyword in the PR description to "Related to" since #4502 should include more such files, and we'd like this PR not to close that issue. If you're interested in contributing further, could you open more PRs after this for other cases where we can parametrize tests?

[agriyakhetarpal]

@all-contributors please add @Aswinr24 for tests

[allcontributors]

@agriyakhetarpal

I've put up a pull request to add @Aswinr24! 🎉